A test pattern of line-pair combinations displayed on a PACS monitor evaluates which aspect of the display?

A test pattern of line-pair combinations displayed on a PACS monitor evaluates which aspect of the display?

• A. Spatial resolution
• B. Grayscale standard display function
• C. Geometric distortion
• D. Ambient room lighting

Answer: (A)

Line-pair patterns on a PACS monitor measure how finely the display can reproduce detail. This tests spatial resolution—the ability to separate two adjacent lines as distinct features rather than merging into one blob. The idea is to present patterns with increasing line-pair frequency (more lines per millimeter) and see up to what point the observer can still distinguish the lines. A display with higher spatial resolution can resolve more line pairs, while a lower-resolution display causes lines to blur together. Grayscale display function would focus on how accurately different shades of gray map to luminance, not on how small or fine the lines are. Geometric distortion would show if shapes are stretched or warped, not whether fine detail is resolved. Ambient room lighting affects perceived contrast but doesn’t change the display’s ability to resolve closely spaced lines.

Line-pair patterns on a PACS monitor measure how finely the display can reproduce detail. This tests spatial resolution—the ability to separate two adjacent lines as distinct features rather than merging into one blob. The idea is to present patterns with increasing line-pair frequency (more lines per millimeter) and see up to what point the observer can still distinguish the lines. A display with higher spatial resolution can resolve more line pairs, while a lower-resolution display causes lines to blur together.

Grayscale display function would focus on how accurately different shades of gray map to luminance, not on how small or fine the lines are. Geometric distortion would show if shapes are stretched or warped, not whether fine detail is resolved. Ambient room lighting affects perceived contrast but doesn’t change the display’s ability to resolve closely spaced lines.